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Davide Mauri

A place for my thoughts and experiences on SQL Server, Business Intelligence and .NET

Using MultiHash Transformation to calculate checksums

I’ve always used Konesans’ Checksum Transformation in order to calculate the checksum of each dimension row to correctly handle SCD changes. But recently I had to change my mind.

I needed to use MD5 as a checksum since I found that using CRC32 or similar in some rare cases the calculated checksum was the same even for different rows, which resulted in a missing update.

While searching for an alternative to Konesans’ good component, I’ve found MultiHash:

http://ssismhash.codeplex.com/

that allows to calculate different kind of hash values, among that MD5, has a public accessible source code and is highly multithreaded (if you really need it).

It works really well: give it a try, I bet you’ll be satisfied!

Published Monday, October 04, 2010 6:19 PM by Davide Mauri

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About Davide Mauri

Davide Mauri - MCP, MCAD, MCDBA, MCT, MVP on SQL Server - has worked with SQL Server since version 6.5, and his interests cover the whole platform, from the Relational Engine to Analysis Services, from architecture definition to performance tuning. He also has a strong knowledge of XML, .NET and the Object Oriented Design principles, which allows him to have the correct vision and experience to handle development of complex business intelligence solutions. Having worked as a Microsoft Certified Teacher for many years, Davide is able to pass all his knowledge to his co-workers, allowing his team to deliver high-quality solutions. He currently works as a Mentor for SolidQ and can be found speaking in many Italian and internationals events.

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